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Traditional DirectX lighting models define ambient lighting as coming from all directions, and is added as a constant on all surfaces regardless of the geometry. Ambient occlusion acts as a factor to ambient lighting to take into account the cavities and concave areas in a model, or how much a surface is hidden from its environment.

After seeing a couple of people using nVidia’s Bloom shader and be dissatisfied with its looks and perfomance, and more importantly because my employer asked me to do it, I made a Bloom shader from scratch.
It is highly customizable, supports FSAA and supports Pixel Shaders 2.0 up to 3.0.

A follow-up to this article with clarifications and corrections to the “real-world considerations” can be found here.

I researched gaussian blur while trying to smooth my Variance Shadow Maps (for the Shadow Mapping sample) and made a pretty handy reference that some might like… I figure I’d post it for my first “Tips” blog post. :)

The full article contains a TV3D 6.5 sample with optimized Gaussian Blur and Downsampling shaders, and shows how to use them properly in TV3D. The article also contains an Excel reference sheet on how to calculate gaussian weights.

A über-simple landscape shader that maps a color ramp to a landscape’s height. Basically, it demonstrates that shaders on landscapes is possible, and can be a nice addition to a visual landscape editor.

This demo is the remake of an old 6.2 demo I had made to test materials and lighting. I was always decieved by that lack of proper bump-mapping in 6.2… so I remade it in 6.5 with custom shaders, very high-resolution textures and normal-maps, and even the moon!

This screen-space shader simulates the hot-air trail left behind by a flying bullet, with chromatic dispersion; similar to the effect that can be seen in the Slo-Mo mode of F.E.A.R. It was originally made for TV3D forum user BeDi.